Double-drum hoist



amh'zngze. 1,574,911 E. B. LEAR DOUBLE DRUM HOIST Filed July 15, 1925 mvENToR EanLB. Leur HIS ATTO EY Patented Mar. 2, 1926.

UNITE' STATES PCTENT Q'FFICTE.

EARL B. L EAR, 0F IPI-IILLIPSBURG, NEW JERSEY, ASS-IGNORV T0 INGERSOLL-RAND- GOMIANY, 0F JERSEY CITY, JERSEY, A CORPORATION' 0F NEW' JERSEY.

DOUBLE-DRUM' HQISI'..

Application filed .Tguly 1.5, 1925. Serial No.. 43,688.4

To a-ZZ whom t may concern.'

Be it known that I, EARL B. LEAR, a citizen of the United `States,`anda resident of Phillipsburg county of l/Varren, and State of New Jersey, have invented a certain Double-Drum Hoist, of whichy the yfollowing is a. speciiication accompanied by drawings This invention relates to hoists but more particularly to a power driven. hoist of the double drum type. v

The objectsI of this invention are toenable either one of two drums, as for instance, a haulage drum and a tail-rope drum, to be driven from a comm-on reversible source of power by automatically connecting one or the other of the drums with a common driving element in accordance with the direction ot rotation of the driving element, and insure the connection of one drum or the other to the driving element with certainty and precision. Other objects will appear hereinafter.

The invention consists. of the combinations ot elements, features. of construct-ion, and arrangement of parts. having the general mode. of operation. substantiallyv as hereinafter described and more particularly pointed out in the appended claims and illustrated in. the accompanying drawings, in which Figure l is an elevation, part-ly in longitudinal section, of a double drum hoist: taken through Figure 2' on the line L-I looking in the direction of the` arrows.

Figure 2 is. a transverse view in section takenv through Figure l on the line 2 2 looking in the direction of the arrows, and

Figure 3 isa top plan view of a portion ot the hoist, partly in section, taken through. Figure 2 on the line 3-3 looking in the direction of the arrows.

Referring to the drawing, the hoist is mounted von a base plate A arranged to swivel on a bed plate B to. enable the hoisttoA be rotated about a vertical axis for locating the hoist with respect to the work. Mounted on one end of the base plate A is a i'liuid actuated motorcomprising a motor casing Cy having an outer head' D carrying a valve chest E. The admission of pressure Huid to? the motor may be effected throughy a suitable connection (not shown.) and the distribution of pressurel fluid isy controlled by a suitable throttle valve F control-led by the throttlev lever Gr. In this instance, the motor indicated is` ofy any suitable reversible type, reversal of which. is controlled by the throttle valve F.

A dri-ving shaft I'I connected at one end tobe rotated by the motor is conveniently supported at yits other end within the cover d? of the gear casing K and is provided with a suitable anti-friction bearing L.` A driving pinion O` is keyed to the driving sha-ft H to mesh with an intermediate gear l? arranged to rotate on: a stationary shaft Q, preferably supported by the gear case cover J. The intermediate gear P ist. provided with anti-friction bearings R `and S to. enable said gear to. rotate freely uponthe shaft Q. A center bearing T encases. the driving shaft II yand is supported at one end within the gear casing K to.r which it isv secured fiX- edlly as bymeans of screws U.. A main driver in the Jorm of an internal gear W is provided with a tubular shaft or sleeve V j ournaled on the center bearing The gear W meshes with an intermediate pinion X preferably formed integrally witlgthe intermediate. gear P. .In this instance,l the tail-A rope drum. Y is journaled on the sleeve V ot the main driver IV, and the haulage drum Z having a bushing b is mounted rotatably upon thecenter bearing 'I".

Usually in hoists of this type, a brake vis provided orone or both drums. tor retardthe drums, and in this instance separate brakes c and g are provided-for the drums,x on the drum iianges cl and 7 respectively,

manipulate-d in any suitable and convenientV manner, as byy the brake levers e and 7i.

Suitable means: are provided for connecting one or the other of the drums Y and Z with the main driver W.. To, this end a ring y' forming` a main driving head is scf-.il

movement between the ring y' and the pawl carrier 0. Disposed in a projection s of the pawl carrier o is a sliding pawl t having a diagonal slot u in its inner face. The pawl t is adapted to slide through a plane extending through the longitudinal axis of the hoist and has opposed engaging portions 'u and w for engaging opposed drum drivers a: and y carried by the drums Y and Z respectively. The opposed drivers m and y are in the form of teeth, preferably formed integrally with the drums Y and Z respec-v tively, although said teeth may be formed on separate members and secured to said drums in any suitable manner if desired. In order to aid in actuating the pawl, t, a pin .a is secured to the ring or head y' and is adapted to rotatewith the ring j through a Vplane transverse to a longitudinal axis of the hoist. The pin a extends through a slot 2 in the pawl carrier 0 and into the diagonal slot u in thel pawl t and this permits slight oscillation of the pawl carrier with respect to the ring j as limited by the roller pin r. By this r arrangement whenever the main driver W,

and consequently the ring together with the pin a are rotated in one direction or the other, the pressure of the pin .e against the walls of the diagonal slot u will automatically cause the pawl to slide in an endwise direction to engage one or the other of the opposed drivers and y on the drums, depending upon the direct-ion in which the main driver is being rotated.

In order that the pawl carrier 0 may be held momentarily stationary upon reversal of the driving shaft H and while the pawl t is being thrown out of engagement with one of the opposed drivers andginto engagement with the other opposed' driver, an automatic brake or drag is provided between the ydrums and Z and shown carried by the pawl carrier y0. For this purpose a pair of hollow plungers 3 and 4 are arranged in a recess 5 in the pawl carrier and a spring 6 is inserted in the plungers to force said plungers outwardly against the drums Y and Z.

In the operation of the device assuming that the driving shaft H is rotating in a counter-clockwise direction, the intermediate gear P together with the intermediate pinion X will cause the main driver W to rotate in a 'clockwise direction as will also the ring or head y'. Rotation of the ring j in this direction will then cause the backs of the drum driver teeth and the pin a to throw the pawl t Vautomaticallyinto engagement with the driver g/ of the drum Zand cause said drum to rotate with the main driver W. Disengagement of the pawl from the driver Y will be prevented by the pin a which will hold said pawl in engaging position until the driving shaft H is again reversed. Upon reversal of the driving shaft H, the pawl carrier 0 will be held stationary momentarily by the braking action of the plungers 3 and 4l against the drums, and the pawl t will then be thrown out of engagement with the driver y and forced into engagement with the driver a@ of the drum Y and rotate said 'drum in a counter-clockwise direction.

It should be understood that the function of the pin z is to actuate and insure the movement of the pawl t to prevent sticking and that after said pawl has been moved into engagement with one or the other opposed drivers, the pin is not exposed to any further strain during the operation of the hoist. p

I claim:

l. In a hoist, the combination of a frame, a driving shaft, a pair of drums rotatable about said driving shaft, opposed drivers carried by said drums, a motor for rotating the driving shaft, a main driver, a pawl carrier on said main driver and connected to be rotated by the driving shaft, a pawl carried by the pawl carrier reciprocable in a plane extending through the longitudinal axis of the hoist, and means including a ring and a pin connected to the main driver rotating through a plane transverse to the longitudinal axis of the hoist to automatically actuate the pawl into engagement with one or the other of said opposed drivers in accordance with the direction of rotation of the driving shaft and to hold said pawl in engagement with either of the opposed drivers.

2. In a hoist, the combination of a frame, a driving shaft supported by said frame, a pair of drums rotatable about said driving shaft, opposed drivers carried by said drums, a motor for rotating the driving shaft, a main driver connected to be rotated by the driving shaft, a pawl carrier rotatable with the main driver and adapted to oscillate with respect thereto, a pawl supported by the carrier reciprocable 1n a plane extending through the longitudinal axis of the hoist and having a diagonal slot, a ring keyed on the main driver, and a pin in said ring reciprocable in the diagonal slot for automatically actuating said pawl into engagement with one or the other of said opposed drivers in accordance with the direction of rotation of the driving shaft and to hold said pawl in engagement with either of the opposed drivers.

3. In a hoist, the combination of a frame, a driving shaft supported by said frame, a pair of drums rotatable about said driving shaft, opposed drivers carried by said drums, a motor for rotating the driving shaft, a main driver connected to be rotated by the driving shaft, a pawl carrier rotatable with the main driver and adapted to oscillate with respect thereto, a pawl supported by the carrier reciprocable in a plane extending through the longitudinal a-Xis 0f the hoist, a diagonal slot across one face of the paWl, a ring keyed to the main driver, a pin in said ring reciprocalole in said slot for automatically actuating said pai-vl into engagement With one or the other of said opposed drivers in accordance With the direction of rotation of the driving shaft and for holding said pawl in engaging position, and a pin between the paWl carrier and the 10 ring to limit oscillation of said pawl carrier. In testimony whereof I have signed this speciication. EARL B. LEAR. 

